Condensed Consolidated Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows from Operating Activities:
Net loss	$ (27,932)	$ (86,071)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization	74,870	18,533
Impairment of oil and gas properties	3,534	35,700
Deferred tax benefit	(2,457)	(24,008)
Unrealized (gains) lossess on derivatives	(303)	973
Amortization of non-cash compensation	1,632	3,114
Amortization of loan costs and discount	8,695	7,311
Non-cash interest expense	3,454	5,153
Loss on early extinguishment of debt		21,661
Other	(2,444)	4,687
Changes in operating assets and liabilities:
(Increase) decrease in receivables	17,568	(15,670)
(Increase) decrease in other current assets	2,355	(23,970)
Increase (decrease) in liabilities	(7,361)	24,500
Net Cash Provided by (Used in) Operating Activities	71,611	(28,087)
Cash Flows From Investing Activities:
Capital expenditures	(107,314)	(116,458)
Acquisitions, net of cash acquired	(1,472)	(228,105)
Increase in restricted cash		(178)
Net Cash Used in Investing Activities	(108,786)	(344,741)
Cash Flows From Financing Activities:
Repayments of borrowings		(244,565)
Borrowings under debt agreements, net of debt discount		580,000
Proceeds from issuance of common stock		61,088
Proceeds from issuance of monetary production payment	125,000
Dividends paid	(416)	(416)
Payments for early extinguishment of debt		(7,248)
Financing costs paid	(15,804)	(27,500)
Other financing		3
Net Cash Provided by Financing Activities	108,780	361,362
Net Increase (Decrease) in Cash and Cash Equivalents	71,605	(11,466)
Cash and Cash Equivalents, Beginning of Period	59,185	106,036
Cash and Cash Equivalents, End of Period	$ 130,790	$ 94,570